Table 2
Ground-state spectroscopic parametersa (MHz) of methyl cyanide isotopologs.
| Parameter | CH3CNb | CH CNc |
13CH3CNc | CH3C15Nc | ||||
|
|
||||||||
| (A−B) | 148 900.103 (66) | 148 904.65 | 149 165.69 | 149 176.96 | ||||
| B | 9198.899 167 (11) | 9194.349 998 (27) | 8933.309 429 (28) | 8 922.038 646 (72) | ||||
| DK × 103 | 2830.6 (18) | 2831. | 2831. | 2831. | ||||
| DJK × 103 | 177.407 87 (25) | 176.673 95 (132) | 168.239 71 (130) | 168.938 71 (336) | ||||
| DJ × 106 | 3807.576 (8) | 3809.737 (37) | 3624.947 (32) | 3555.251 (45) | ||||
| HK × 106 | 164.6 (66) | 165. | 165. | 165. | ||||
| HKJ × 106 | 6.062 0 (14) | 6.004 5 (131) | 5.803 0 (141) | 5.647 6 (181) | ||||
| HJK × 109 | 1025.69 (15) | 1017.45 (86) | 927.19 (86) | 951.05 (131) | ||||
| HJ × 1012 | −237.4 (21) | −258.4 (61) | −273.3 (49) | −183.1 (67) | ||||
| LKKJ × 1012 | −444.3 (25) | −444. | −431. | −444. | ||||
| LJK × 1012 | −52.75 (51) | −49.75 (236) | −49.66 (266) | −49.6 | ||||
| LJJK × 1012 | −7.901 (32) | −7.214 (141) | −6.887 (128) | −7.057 (182) | ||||
| LJ × 1015 | −3.10 (17) | −3.10 | −2.76 | −2.74 | ||||
| PJK × 1015 | 0.552 (68) | 0.55 | 0.51 | 0.50 | ||||
| PJJK × 1018 | 55.3 (22) | 55. | 49. | 49. | ||||
| eQq | −4.223 08 (107) | −4.218 28 (176) | −4.218 30 (197) | n.a. | ||||
| Cbb × 103 | 1.845 (90) | 1.844 | 1.792 | |||||
| (Caa−Cbb) × 103 | −1.15 (31) | −1.15 | −1.10 | |||||
Notes.
Numbers in parentheses are one standard deviation in units of the least significant figures. Parameters without quoted uncertainties have been estimated from the main isotopic species and were kept fixed in the fits; see Sect. 3.
From Müller et al. (2015).
From Müller et al. (2009); adjusted in this work to account for slight changes in the parameters of the main isotopolog from that work compared to those in Müller et al. (2015).
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